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How to increase image size without losing quality ? 16x16 is very small, almost impossible to see. May seem like a dumb question but honestly i do not know how to do it.

thank you in advance

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You're looking for "texture filter" or "filter" feature in your engine/framework of choice and "nearest" or "point" or "no filtering" value for that.

Sorry cannot help you any further not knowing what software you use. 

(https://en.wikipedia.org/wiki/Texture_filtering#Nearest-neighbor_interpolation)

And don't worry, asking questions is good. I'm glad I can help.

I am using Gimp or Krita, I'm learning to use them yet, thanks for the answer, I'll search more about it.

In Gimp you can use "Image" -> "Scale Image..." and then in a popup window choose "Interpolation" to be "None" and resize e.g. 300% or whatever you like..

In Krita you can use "Image" -> "Scale Image To New Size..." and then in a popup window choose "Filter" to be "Box" and resize e.g. 300% or whatever you like.

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It worked for both, thank you very much. You recommend some tutorial for pixel art ?

I'm glad  it helped.

No idea for a pixel tutorial; but I recommend limiting yourself: small resolution (like 16x16 or even 8x8), few colours (2-5) - it's easier to get decent results.